add api/task/get-archive-task method

backend/modules/task/models/ProjectTaskSearch.php

@@ -2,10 +2,8 @@
 
 namespace backend\modules\task\models;
 
-use backend\modules\project\models\ProjectUser;
 use yii\base\Model;
 use yii\data\ActiveDataProvider;
-use backend\modules\task\models\ProjectTask;
 
 /**
  * TaskSearch represents the model behind the search form of `backend\modules\task\models\Task`.